AWhat changed
PHENIX measured high-transverse-momentum charged hadrons in gold–gold collisions at 200 GeV per nucleon pair and compared them with neutral-pion and nucleon-collision references. Central gold–gold collisions showed strong suppression, whereas the deuteron–gold control showed no comparable suppression and a modest charged-hadron enhancement. Together the measurements support a dense-medium final-state interpretation.
Scientific scope
PHENIX measured high-transverse-momentum charged hadrons in gold–gold collisions at 200 GeV per nucleon pair and compared them with neutral-pion and nucleon-collision references. Central gold–gold collisions showed strong suppression, whereas the deuteron–gold control showed no comparable suppression and a modest charged-hadron enhancement. Together the measurements support a dense-medium final-state interpretation. The comparison is restricted to the cited collision energies, centrality selections, midrapidity acceptance and measured momentum ranges. The charged-hadron proton–proton reference was constructed using the neutral-pion spectrum and a hadron-to-pion ratio, and binary-collision normalization uses a Glauber model. Suppression is an observation; parton energy loss and the microscopic state of the medium are interpretations, not a direct unique identification from these measurements alone.
Evidence
The linked original works support the scoped statement and contribution attribution. WRS has not independently replayed experiments or reconstructed a full mathematical proof. The comparison is restricted to the cited collision energies, centrality selections, midrapidity acceptance and measured momentum ranges. The charged-hadron proton–proton reference was constructed using the neutral-pion spectrum and a hadron-to-pion ratio, and binary-collision normalization uses a Glauber model. Suppression is an observation; parton energy loss and the microscopic state of the medium are interpretations, not a direct unique identification from these measurements alone.
Contributors
- The named authors in the research record · SCIENCE: Credit belongs to the cited collaborations. The individual author list is incomplete; no sole discoverer or individual effort share is inferred.
- Absence of Suppression in Particle Production at Large Transverse Momentum in d+Au Collisions
- High-pT Charged Hadron Suppression in Au+Au Collisions at 200 GeV
Provisional WRS assessment, edition 2026-10-28.1. Independent expert calibration is pending. This grade does not certify correctness or assign ownership.
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